package com.yuelao.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

/**
 * 数据压缩工具
 *
 * @author fengliye
 * @version v1.0
 * @date 14/12/2018 14:41
 * @modify detail
 * 版本       修改人        修改时间      修改内容描述
 * ---------------------------------------------
 * <p>
 * ---------------------------------------------
 */
public class GzipUtil {
    public static byte[] gzip(byte[] data) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        GZIPOutputStream gzip = new GZIPOutputStream(bos);
        gzip.write(data);
        gzip.finish();
        gzip.close();
        byte[] ret = bos.toByteArray();
        bos.close();
        return ret;
    }

    public static byte[] ungzip(byte[] data) throws Exception {
        ByteArrayInputStream bis = new ByteArrayInputStream(data);
        GZIPInputStream gzip = new GZIPInputStream(bis);
        byte[] buf = new byte[1024];
        int num = -1;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((num = gzip.read(buf)) != -1) {
            bos.write(buf, 0, num);
        }
        gzip.close();
        bis.close();
        byte[] ret = bos.toByteArray();
        bos.close();
        return ret;
    }
}
